Electric pneumatic-pressure controller.



E. K. PARKER.

ELECTRIC PNEUMATIC PRESSURE CONTROLLER.

APPLICATION FILED AUG. l2 1912.

1&15930 Patented Dec. 16,1913.

nowaan K; manna, or $ANTA ananas, oaLIroaNrs.

amoral-.0 rnauma'rrc-raas'suan oorrraonrna.

menses.

"Specification of Letters Patent.

Patented Dee-l6, 31913.

Application filed August 12, 1912. Serial No. 714,584.

- To all whom it may concern:

Be it known that I, EDWARD K. PARKER,

a citizen of the United States, and resident and more particularly itrelates to electrically operated means for controlling the valve in suchsystems, whereby .the pneumatic pressure or power may be shut off or'let 'on instantaneously at the will of the operator, or shut ofiautomatically at a predetermined degree of pressure.

While my invention is peculiarly adapted for automatically shutting ofithe pressure in pneumatic pressure apparatus, when the pressure reachesa predetermined point, it will be understood that the invention is by nomeans limited to such use. 1

In the drawings hereto annexed, which illustrate certain embodiments ofmy invention,Figure 1 is a diagrammatic view, partly in elevation andpartly in section, of an automatically controlled pneumatic pressureapparatus; Fig. 2 is a vertical, central section through the pressuregag-e shown in Fig. 1.

Referring to the drawings, A is an airtight casin upon which is mounteda conduit B having an inlet port 6 and an outlet port 6, and forming ineffect a part of the casing. Within said conduit B and located betweensaid ports 6 and b is a valve seat 6 tor the valve C, said valve beingslidably mounted in said conduit and piwotally connected at one end to alever D, which is pivoted within said casing A at d and provided with astud d. Mounted upon the bottom of said casing A in any suitable manneris an electro-magnet E consisting of an armature e, a guide-tube e and acoil 6 A spring is located within said tube e between said armature andthe bottom of said tube; and said armature e is provided at its top witha hook or projection e and a inger .e". Upon a side .wall of said casingA is mounted another electro-magnet F consisting of an armature f, aguide-tube f and a'ooil P. A spring f is located within said tube fbetween said armature and the bottom .of said top with flfhOOk orprojection f Slklably mounted upon an inner wall of said casing is abolt G provided near one end with a'stud g, said bolt adapted tocooperate with said armature f to lock the valve C in open position aspresently to be described.

A pressure gage H is mounted in the usual manner upon an extension B onthe conduit B, and is provided with the usual dial h, index hand it andglass front k Said glass front has a central opening in which isrotatably mounted a metallic plug b preferably provided with a knob orhandle 02 on its outer .end and having a metallic indicator h upon itsinner end, said indicator being preferably hooked, or curved inward, atits free end as clearly shown in Fig. 2. A metal strip It serves as ametallic connection between said plug a and the extension B upon whichthe gage is mounted. It will be understood that the index hand h is inmetallic connection with the extension. B through its pivot pin and thedial, and the casing of the gage.

Suitable electric connections for energizing the .elcctro-magnets F andE and actuating the device are provided as follows: For energizing theelectro-magnet F the connection is, by the wire J rrom the strip h toone end of the coil 1; by the wire J from the other endof said coil f tothe binding post is of the battery K; from the binding post Kby the wireJ to the casing A, which -is in metallic connection withthe index handIt through pipes B, B and gage casing H. For energizing theelectro-magnet E, the connection is from the binding post K. by wire Jto the cQntact point L, forming one end of a normally {open switch; fnomthe other contact point L of said switch by the wire J to one end f thecoil 6 and by the wire J from the other end .05 said eoil e to thebinding post is.

The operation .015 the device is as follows: rte operator desiring forexample to inflate an automobile tire and automatically to shut cit thepneumatic pressure, say at a pressure of 30 pounds to the square inch,sets the indicator It at :30 upon the gage dial. The switch comprisingcontacts L and L is closed, .thereby closing the circuit which energizesthe eleotro-magauet E and causing the anmature e to be drawn down fromits normal position shown in dotted lines in Fig. 1 to the positionshown in 5 111 lines in said figure. Upon its downward passage the hooka engages the stud d or the lever D and drawssaid lever downward, thusopening the valve C. It will be observed that the hook e is of suchlength that it has traveled a considerable distance upon its downwardpassage before it engages the stud d so that it strikes sharply againstsaid stud and draws the lever D quickly downward The armature e, andconsequently the valve C, is locked and retained in its depressedposition by the sliding bolt G which is pushed forward by the armaturef, actuated by the spring f into engagement with the end of finger e Thevalve being thus opened and locked in open position, the air or gas froma suitable source of pneumatic pressure (not shown) enters by the intakeport I) and issues from the outlet port I). The pressure causes theinde'zr hand 11. to travel over the faceof the dial in the usual manneruntil it comes in contact with the hooked end of the indicator 72., thusclosing the circuit which operates 'the electro-magnet F. When saidelectro-magnet is thus energized the armature f is drawn backward, andin its backward movement the projection i engages the stud g andwithdraws the bolt G from contained within the valve casing which istight against leakage and closed to the atmosphere except through theinlet port I) and through the valve. Thus, by this construction alldanger of leakage due to defective packing or bushings is eliminated andfurthermore the device may be made in .very compact form.

I claim:

'1. In a device of the class described, a

- casing having an inlet port and an outlet port, a valve, a seat forsaid valve located etween said ports, a lever pivoted in said casing, aconnection between said lever and said valve, an electro-magnet mountedon said casing and having a spring-pressed armature adapted tocotiperate with said lover to open and close said valve, a bolt, anothereiectro-magnet mounted on said casing having a spring-pressed armatureadapted to codpera'te with said bolt to lock said valve in openposition, a pressure gage ection f mounted on said casing and having arotatably mounted indicator and an index hand, and an electricalconnection between said last named electro-magnet and said gage wherebywhen said index hand makes contact with said indicator said armaturecooperates with said bolt to unlock said valve.

2. In a device of the class described, a casing having an inlet port andan outlet port, a valve, a seat for said valve located between saidports, a lever pivoted in said casing, a connection between said leverand said valve, an electro=magnet mounted on said casing and having aspring-pressed armature provided with a projection, said projectionadapted to cooperate with said lever to open said valve, a bolt slidablymounted on said casing and having a stud, another electromagnet mountedon said casing and comprising a spring-pressed arma- I ture providedwith a projection, said arma ture adapted to cooperate with said bolt tolock said valve in open position, a pressure gage mounted on said casingand having a ,rotatably mounted indicator and an index hand, and anelectrical connection between said gage and said last namedelectromagnet whereby when said index hand makes contact with. saidindicator, said projection cooperates with said stud to draw said boltand unlock. said valve.

3. In a device of the class described, a casing having an inlet port andan outlet port, a valve, a seat for said valve located between saidports, a lever pivoted in said casing, a connection between said leverand said valve,

an elect-romagnet mounted on said casing and having a spring pressedarmature provided with a projection, said projection adapted during thedownward movement of said armature to engage said lever to open saidvalve, a bolt slidably mounted on said casing and having a stud, anotherelectro- 'magnet mounted on said casing and comprising a spring pressedarmature provided with a projection, said armature adapted to cooperatewith said bolt to lock said valve in open position, a pressure gagemounted on said casing and having a rotatably mounted indicator and anindex hand, and an electrical connection between said gage and said lastnamed electromagnet whereby when said index hand makes contact with saidindicator, said armature is retracted and during its backward movementsaid projection cooperates with said stud to draw said bolt andunlocksaid valve.

Signed by me this 19th day of July, 1912.

EDWARD K. P R.

/Vitnesses:

E. H. Sonata, Anrnon E. Osnwr.

